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I. WHITELAW.

SEWING MAcHxNE Foa LlNnsmcHmG. APPLICATION FILED JAN. 811912- E1,195,633, Patented Aug. 22,1916.

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1'.. WHITELAW.

SEWING MACHINE FOR BLINDSTITCHING.

APPLICATION FILED IAN. 8,1912.

Patented Aug. 22, 1916.

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1. WHITELAW.

SEWING MACHINE FOR BLINDSTITCHlNG.

APPLICATION FILED IAN. 8,1912.

I. WHITELAW.

SEWING MACHINE FUR BLINDSTITCHINGl` APPLICATION FILED 1AN8| 'ISJIZlPatented Aug. 22, 1916.

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SEWING MACHINE FOR BLINDSTITCHING.

APPLICATION FILED .IAN-8.19M-

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` APPLICATION FILED IAILB, i912. Lws

M. mim, m (1.1 ferr/L r. 1U MIZ @n IWW I I www mw JUS IGI: ,m a I P ,mff r JW/W 5 g Q JAMES WHITELAW, 0F ST. LOUIS, MISSOU'R.

SEWING-MACHINE FOR BLINDSTITCHING.

'To all whom t vmay concern Be it known that I, JAMES lViirrnniw,citizen of the United States, residing at St. Louis, in the State ofMissouri, have invented certain new and useful Improvements inSewing-Machines for Blindstitching, of which the following is aspecification.

`My invention relates to improvements in sewing machines for blindstitching, and has for its general object` to provide a. simple,efficient, compact, and robust machine, particularly adapted, in someof.its features,

fory making a blind chain-stitch.

In the drawings, wherein I have illustratedV an embodiment ofmyinvention,4

Figure 1 is a front elevation thereof with the" cover plate' removed andparts broken awayg-FigQ is a similar plan view; Fig. 3

1S an enlarged perspective detail showing the stitch-forming mechanismin operation; Fig. 4 is an end elevation from the stitching end (left ofFig. 1); Fig. 5 is a section on line 5-5 of Fig. 1; Fig. 6 is a sectionon line 6-6 of Fig. l; Fig. 7 is a section on line 7-7-7 of Fig. 1; Fig.8 is a horizontal section on line S-S of Fig.v l; Fig. 9 is a plandetail of the feed plate and contiguous parts; Fig. l0 is allongitudinal section on line 10 l0 of Fig. 4; Fig. v11 is transversesection on line 1.1-11 of Fig. 1; Fig. l2 is a section on line 12e-12 ofFig. 1; Fig. 13 is a section on line 13-13 of Fig. 11 Fig. 14 is adetail of an eccentric construction on the back of the frame; Figs. 15,1G, and 17 are perspective details showing successive phases in thestitch formation; Fig. 18 shows the stitch formation; and, Fig. 19 is across` section on line 19 19 of Fig. 2. l j

In the specific construction shown in the drawings, the main frame "2.5is provided at one end with a baseQG from which rises an end wall 27 anda rear Wall 2S, the latter branching longitudinally into the rear walls29 and 30, respectively, of two longitudinal `arms 'which are to affordsupport respecarm and an opposed portion 33 forming the top of thelowerarm. With this integral lframe structure may be associated a singlepiece detachable covermember 34, providing "a front Wall suitably shapedto cooperate Specification of Letters Patent.

Patented Aug. 22, 19H5.

Application filed January 8, 1912. Serial No. 669,927.

with the walls 33 and 32 of the respective arms, and with a top wallshaped to coact with the upper surface of the arm 29, thereby to housethe gear mechanism, shaftine, and the like, contained in the right endof the mach-ine. The cover piece 34 may convenient-ly be secured invplace by a single thumb screw 35, taking into a suitably shaped edgeportion of the cover member and engaging in a slot 3G in the rear wall2S of the main frame member.

The driving shaft 40 ofthe machine extends transversely through anelongated bearing sleeve 41, preferably provided with an oil recess 42and mounted in a suitable boss 43 in the rear wall 2S of the frame, saidshaft at its outer end bearing the pulleyhand-wheel 44 and an eccentric45, and inside vof the frame bearing a disk 46 which may conveniently bemade in shape to perform the work of several elements.

The eccentric 45, through the strap 47 and arm 48, moves the crank 49 ona needle bar shaft 50 which extends through a suitable transversebearing at the end or head of upper arm Q9, and said shaft bears theneedle bar 51, in which is mounted the needle 52. The needle, which ispreferably of curved, side-pointed construction, Aslightly angulated tothe path of its.reciprocatioin is secured in the arm by a clamp memberhaving anextension wing 54 in which there are made a thread eye 55 andgroove 5G, the latter being overlain near its lower end by the tip of anL-shaped spring 57, as best shown in Fig. 4.

TheA needle works over the top of a presser-foot vertically guided inand secured to a-head end ofupper arm '29, as by screw G1. Thestationary presser-foot 60 has its under side suitably shaped forcoaction with the cloth-handling devices and is provided with a centralaperture G1' through which a portion of the cloth to be 'stitched may bepresented 'to the needle. To the top of the ,presser foot is attached aueedle-detlecting guide 62, to steady and de- 'lect the needle adjacentits point of penetration of the goods, and in said presser-foot is madea clearance recess 63 for a looper point to be described.

Thelooper 70 is a vertical member, preferably provided with a singlehorizontal point 71 at its lower end, its shank at its upper endadjustably engaging'an enlargement 72 of a horizontal looper bar- 73,the

5` vildireetion.

` The work handling mechanism, arranged mains at rest until after thelooper has com- 'pleted its loop-taking movement across the needle`path, and then as the looper isin the course of its forward travel toloop-delivering position, such travel of the looper being accompanied bya relatively rapid move- Ament vof the take-up in a thread-slackingbelow and cooperating with the stationary presser foot comprises a clampmember to hold the goods to the under side of the presser foot, a feedmember for advancing 'the goods, and a plungermember for elevating anode of the goods to be acted upon by the needle while the surroundinggoods is clamped by the clampingmember.

The clamp member-130 extending transversely of the machine, or away fromthe operator, is arched preferably in both the direction of its lengthand of its width. It is carried by the linger 131 of a bell crank -lever132 Xed to a Vlongitudinal shaft 133` which finds a bearing in asuitable projection of a block 134, said block supplementing theextremity of the lower arm casting to provide the necessary bearings forparts to be described, and secured to said arm extremity as'vby a screw135.` The extremity of crank arm 132 has an enlargement 136ffrom whichextendsan arm 137 connected to the mid-portion of the -clampmember 130,and

in the enlargement 136 is made a' squared aperture engaging a squaredportion 139 'of a sleeve 140 in which rotates the extremity of the feedactuating shaft`v 141.

the last named section being mounted, in constant position in a sleeve-142 secured to theend wall 27 of the frame, and connected to -theforward portion 1415 by a luniversal spiral gear 146 cutmon itsVperiphery and meshing (in vone-to-one geared relation) with the spiralpinion 147 secured'to the shaft section 141, said gear 147 having`lon`gitudinally projecting ears 148 in which' is pivoted, as lat, 149, (Fig.1), a block .150 (Fig. 8) having pivoted thereto on` pin 151 appropriatematerial, as at 161.

Said feed shaft is made in two sections 141x and141, V

o ger.

at right angles to pivot 149 a yoke 152 conA nected with shaft section141x.

The clamp member 130 is preferably arranged to be elevated to clampingposition by a friction-drive mechanism working on its shaft 133, and tothis end the feed shaft Section 141a is provided, preferably beyond theframe wall 2T with aspur pinion 155 meshing with a gear 156 loosely'Vmounted on the hub 157 of a disk 158 secured `to the shaft 133, whichextends the full length of the machine. rl`he disk 158 is opposed by asecond disk 15S) lying on the opposite side of the gear 156 and slidablerelative to the disk 158 on pins 160, the confronting faces of the twodisks 158 and 15,` which coact with the gear 156 being faced with felt,or other The disk 159 is pressed toward thedisk 158to exert a frictiongrip on the gear 156 by means of a spring 162y surrounding the extremityof the shaft 133 abutting at one end against -the disk 159 and at itsvouter end against a nut 162 on the threaded extremity of the shaft 183.The friction gear described may conveniently be housed in an extension164 forming a detachable extension of the'end wall of the casing. 4lfVhen the driying pulley is rotated in a clock-wise direction (asindica-ted by the arrow in Fig. 1) the gear wheel 156 is rotated to moveits top toward the operator and the friction disk carried by the shaft133 tends to move therewith, so that the clamp member is-raised toclamping, position, but may be depressed at any time against theresistance ofl the frictional elevating means. 'A' stud 165 upon thedisk 158 a'ords a point for connection of a lifting knee lever, notshown, by which the shaft 133 may be. rocked to depress the clampwhenever desired.

The feed member comprises a ver-tical feed 'dog 170 having its topshaped toprovide two Aparallel feed points lying side by side andconnected together at their front and rear ends to leave an interveningspace for the accommodation of the plunger to be described, the clampmember being provided with suitable, openings 173 for the movement ofthe feed points 171, and with an intermediate opening 174 toaecommoi'late the plun- V The lower end of the feed member is slotted asat 175 adjpstably to receive a bolt 176 clamped to the dog, by'a nut177, said lbolt being mounted to roekwith au arm 17.) "pivoted as at 180to the front of the frame. The feed member is socketed to,coi-imiet'u'ith ya parti-spherical eccentric 181 secured to the fee'dshaft section 141", so that under the action of theA eccentric it rises,carrying with it the bolt-176and falls, and oscillates fore 'and aft onsaid bolt 176 as a center. ltwill -,be apparent that if the feed dog beadjusted to meet theunder side of the presser foot before'it completesits rise, the action of the eccentric willy depre the shaft section 141Xand carry down Wi h it, through lever connection 132, the clamp plate130. so to Jr'ree the goods for advance by the feed. Depression of theclamp plate for insertion of goods carries with it the feed through theconnection of arm 132 with the feed shaft.

The plunger proper 187, arranged to work,

. through the appropriate openings in the feed, clamp, and presser foot,is carried by vertical slide 188 suitably guided in the frame forvertical reciprocation. Reciproger shaft 190 is mounted in a slide block1.()6

vertically guided in the frame and normally sustained by a long leafspring; 197 in elcvated position determined by the contact of said slidewith the tapered point ot' an adjusting screw 199, best shown in Fig:Ob-y viosly by adjusting the screw 199 the limits of throw of theplunger point may bc varied.

In the operation of the machine thc plunger is so adjusted that itraises a. node of goods through the presser-foot opening in appropriatetime to be penetrated by the needles forward thrust, the plungerreceding as soon as the needle has penetrated thc goods. The feed, otcourse. makes its etl'ec- 4tive feeding,r movement while the needle isout of the goods, and its adjustment is preferably such that the clampplate is depressed,

as heretofore described. duringY the time that the feed is advancing.-the work. The stitch is ot' the well known form shown in'Fig. 18. `WhileI have herein described a specific embodiment of my invention forpurposes of a lull and operative disclosure thereof it will beunderstood by those skilled in the art lthat many changes might be madein structure and arrangement within the spirit of my invention andwithin the scope of the appended claims. i

Vvhat I claim is:

1.' In a sewing` machine, stitch forming mechanism comjn'ising areciprocating needle, a needle-thread take-up, a needle-thread looper havine` a vibrating part, and means to move the take-up in harmony withthe vibrating part of thc looper through a part only ot' the. movementof the latter.

2. In a sewing machine the combination of a. reciprocating' needle, alooper mechanism having;r a vibrating part, a take-up arm, yieldingconnections between the takeup arm and the vibrating par-t of thelooper, and a stop for the take-up arm arranged to `Vcojurse of movementof the looper part.

prevent the take-up arm following thevfull 3. In a sewing machine,stitch forming mechanism comprising a reciprocating needle, a mainshaft, a needle thread looper mechanism covperating therewith actuatedby said main shaft and coperating with said needle, and a needle threadtake up mechanism mounted for movements distinct from those of saidneedle and said looper mechanism and operated by said looper mechanism.l

4t. In a sewing machine, stitch-formingmechanism comprising areciprocating needle, a vertical looper member arranged to work aboutsaid needle, a looper bar hori zontally disposed and at its active endcarry ing said looper, a swinging yoke, means to move said yoke to movethe looper bar bodily up and down and axially, means to' oscil late saidlooper bar about its own axis, take-up, a yielding; connection betweenthe take-up and the yoke, and a stop for the take-up arranged forpreventing the same. from following the full course of movement et' saidyoke.

In a. sewin,f r machine, stitch-forming mechanism comprising alreciprocating` needle, a movable part arranged for a relatively lontrrange of movement, a. take-up arm, a vieldincT connection between the.ltake-up arm and said movablevpart, and a stop for take-up arm arrangedto prevent said arm from followingr the full course of movement of saidmovable part.

(l. In a sewing machine, stitch-forming; mechanism comprising areciprocating needle, a needle thread loopcr mechanism cooperating.therewith, a needle thread takeup lever pivotally supportedindependently o't' said looper mechanism, and operative connectionsbetween said take-up lever and said looper mechanism to operate saidtakeup from said looper mechanism.

7. In a sewing machine, stitclrforming mechanism comprising areciprocating7 needle, a needle thread looper mechanism cooperating!therewith having a vibrating part, a. take-up lever, a stop restrictingthe movement of the take up lever in one direction,

a second lever resiliently connected to theA take-up lever to move thelatter away from the stop and to move away from the take-up lever whenthe latter is stoppedinits travelV in the opposite direction, and a linkconnection between the last recited lever and the vibrating part of thelooper mechanism.

In testimony whereof I hereunto set my hand in thepresence of twowitnesses.

JAMES WH ITELVV. In the presence of- L. M. Love, H. Hos.

